hexagon: add unary tanh op (#22999)

ggml/src/ggml-hexagon/ggml-hexagon.cpp

@@ -2865,6 +2865,7 @@ static htp_op_code op_remap_to_htp(const ggml_tensor * t) {
                 case GGML_UNARY_OP_NEG:      return HTP_OP_UNARY_NEG;
                 case GGML_UNARY_OP_EXP:      return HTP_OP_UNARY_EXP;
                 case GGML_UNARY_OP_SOFTPLUS: return HTP_OP_UNARY_SOFTPLUS;
+                case GGML_UNARY_OP_TANH:     return HTP_OP_UNARY_TANH;
             default:
                 break;
             }
@@ -3335,6 +3336,7 @@ static bool ggml_backend_hexagon_device_supports_op(ggml_backend_dev_t dev, cons
                 case GGML_UNARY_OP_EXP:
                 case GGML_UNARY_OP_SIGMOID:
                 case GGML_UNARY_OP_SOFTPLUS:
+                case GGML_UNARY_OP_TANH:
                     supp = ggml_hexagon_supported_unary(sess, op);
                     break;
                 case GGML_UNARY_OP_SILU:

ggml/src/ggml-hexagon/htp/htp-ops.h

@@ -62,6 +62,7 @@ enum htp_op_code {
     HTP_OP_UNARY_EXP,
     HTP_OP_UNARY_NEG,
     HTP_OP_UNARY_SOFTPLUS,
+    HTP_OP_UNARY_TANH,
     HTP_OP_GLU_SWIGLU,
     HTP_OP_GLU_SWIGLU_OAI,
     HTP_OP_GLU_GEGLU,

ggml/src/ggml-hexagon/htp/main.c

@@ -542,6 +542,7 @@ static int execute_op(struct htp_ops_context * octx) {
         case HTP_OP_UNARY_SIGMOID:
         case HTP_OP_UNARY_NEG:
         case HTP_OP_UNARY_EXP:
+        case HTP_OP_UNARY_TANH:
         case HTP_OP_L2_NORM:
             return op_unary(octx);
 

ggml/src/ggml-hexagon/htp/unary-ops.c

@@ -373,6 +373,21 @@ static void l2_norm_f32(const float * restrict src,
     }
 }
 
+static void tanh_f32(const float * restrict src,
+                     float * restrict dst,
+                     uint8_t * restrict spad,
+                     const uint32_t num_rows,
+                     const uint32_t row_elems,
+                     const size_t   row_size,
+                     int32_t *      op_params) {
+    for (uint32_t ir = 0; ir < num_rows; ir++) {
+        const uint8_t * restrict src_local = (const uint8_t *)src + (ir * row_size);
+        uint8_t * restrict dst_local       = (uint8_t *)dst + (ir * row_size);
+
+        hvx_tanh_f32_aa(dst_local, src_local, row_elems);
+    }
+}
+
 static void unary_job_f32_per_thread(unsigned int nth, unsigned int ith, void * data) {
     const struct htp_unary_context * uctx = (const struct htp_unary_context *) data;
     struct htp_ops_context * octx = uctx->octx;
@@ -477,6 +492,9 @@ static void unary_job_f32_per_thread(unsigned int nth, unsigned int ith, void *
             case HTP_OP_UNARY_SOFTPLUS:
                 softplus_f32(src0_spad, dst_spad, NULL, block_size, ne0, src0_row_size_aligned, op_params);
                 break;
+            case HTP_OP_UNARY_TANH:
+                tanh_f32(src0_spad, dst_spad, NULL, block_size, ne0, src0_row_size_aligned, op_params);
+                break;
             case HTP_OP_L2_NORM:
                 l2_norm_f32(src0_spad, dst_spad, NULL, block_size, ne0, src0_row_size_aligned, op_params);
                 break;
@@ -547,10 +565,12 @@ static int execute_op_unary_f32(struct htp_ops_context * octx) {
         case HTP_OP_UNARY_SOFTPLUS:
             op_type = "softplus-f32";
             break;
+        case HTP_OP_UNARY_TANH:
+            op_type = "tanh-f32";
+            break;
         case HTP_OP_L2_NORM:
             op_type = "l2norm-f32";
             break;
-
         default:
             FARF(ERROR, "Unsupported unary Op %u\n", octx->op);
             return HTP_STATUS_NO_SUPPORT;